Where can I buy a small kitchen sink?

I want to put in a small prep sink on an island unit but am having problems finding one. Worktop is laminate so I can't install an undermounted sink, and any inset sinks seem to be very big, around 44 cm wide. I think that's too big given that there is already a main sink with drainer elsewhere in kitchen.
Any suggestions?

B&Q sell a small round inset sink with a seperate small round inset drainer.